<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 头部警告区域 -->
      <el-alert
        title="注意：只允许为第三级分类设置相关参数"
        type="warning"
        :closable="false"
        show-icon
        v-show="isBtnDisabled"
      >
      </el-alert>
      <!-- 选择商品分类区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类：</span>
          <!-- 选择商品的级联选择框 -->
          <el-cascader
            v-model="selectedCateKeys"
            :options="catelist"
            :props="cateProps"
            @change="handleChange"
          ></el-cascader>
        </el-col>
      </el-row>
      <!-- tab页签区域 -->
      <el-tabs v-model="activeName" type="card" @tab-click="handleTabClick">
        <!-- 添加动态参数的面板 -->
        <el-tab-pane label="动态参数" name="many">
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisabled"
            @click="addDialogVisible = true"
            >添加参数</el-button
          >
          <!-- 动态参数表格 -->
          <el-table :data="manyTabData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="{ row }">
                <!-- 循环渲染tab标签 -->
                <el-tag
                  v-for="(item, index) in row.attr_vals"
                  :key="index"
                  closable
                  @close="handleClose(index, row)"
                  >{{ item }}</el-tag
                >
                <!-- 输入文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="row.inputVisible"
                  v-model="row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(row)"
                  @blur="handleInputConfirm(row)"
                >
                </el-input>
                <!-- 添加按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column align="center" type="index" label="#">
            </el-table-column>
            <el-table-column prop="attr_name" label="参数名称">
            </el-table-column>
            <el-table-column label="操作">
              <template slot-scope="{ row }">
                <el-button
                  type="primary"
                  icon="el-icon-edit"
                  size="mini"
                  @click="showEditDialog(row.attr_id)"
                  >编辑</el-button
                >
                <el-button
                  type="danger"
                  icon="el-icon-delete"
                  size="mini"
                  @click="removeParams(row.attr_id)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 添加静态属性的面板 -->
        <el-tab-pane label="静态属性" name="only">
          <el-button type="primary" size="mini" @click="addDialogVisible = true"
            >添加属性</el-button
          >
          <!-- 静态属性表格 -->
          <el-table :data="onlyTabData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="{ row }">
                <!-- 循环渲染tab标签 -->
                <el-tag
                  v-for="(item, index) in row.attr_vals"
                  :key="index"
                  closable
                  @close="handleClose(index, row)"
                  >{{ item }}</el-tag
                >
                <!-- 输入文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="row.inputVisible"
                  v-model="row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(row)"
                  @blur="handleInputConfirm(row)"
                >
                </el-input>
                <!-- 添加按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column align="center" type="index" label="#">
            </el-table-column>
            <el-table-column prop="attr_name" label="属性名称">
            </el-table-column>
            <el-table-column label="操作">
              <template slot-scope="{ row }" v-show="row.attr_name">
                <el-button
                  type="primary"
                  icon="el-icon-edit"
                  size="mini"
                  @click="showEditDialog(row.attr_id)"
                  >编辑</el-button
                >
                <el-button
                  type="danger"
                  icon="el-icon-delete"
                  size="mini"
                  @click="removeParams(row.attr_id)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>
    <!-- 添加参数/属性的对话框 -->
    <el-dialog
      :title="'添加' + titleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addDialogClosed"
    >
      <!-- 添加参数的对话框 -->
      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>
    <!-- 修改参数/属性的对话框 -->
    <el-dialog
      :title="'修改' + titleText"
      :visible.sync="editDialogVisible"
      width="50%"
      @close="editDialogClosed"
    >
      <!-- 添加参数的对话框 -->
      <el-form
        :model="editForm"
        :rules="editFormRules"
        ref="editFormRef"
        label-width="100px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  name: "Params",
  props: [],
  data() {
    return {
      //商品分类列表
      catelist: [],
      //级联选择框配置对象
      cateProps: {
        expandTrigger: "hover",
        value: "cat_id",
        label: "cat_name",
        children: "children",
      },
      //级联选择框双向绑定的数组
      selectedCateKeys: [],
      // 被激活的页签的名称
      activeName: "many",
      // 动态参数数据
      manyTabData: [],
      //静态参数的数据
      onlyTabData: [],
      //控制添加对话框的显示与隐藏
      addDialogVisible: false,
      // 添加参数的表单对象
      addForm: {
        attr_name: "",
      },
      //添加参数的校验
      addFormRules: {
        attr_name: [
          { required: true, message: "请输入参数名称", trigger: "blur" },
        ],
      },
      //控制修改对话框的显示与隐藏
      editDialogVisible: false,
      // 添加参数的表单对象
      editForm: {},
      //修改参数的校验
      editFormRules: {
        attr_name: [
          { required: true, message: "请输入参数名称", trigger: "blur" },
        ],
      },
      //已经单独加载每个对象上
      // //控制按钮与文本框的显示
      // inputVisible: false,
      // //文本框输入内容
      // inputValue: "",
    };
  },
  created() {
    this.getCateList();
  },
  methods: {
    //获取所有的商品分类
    async getCateList() {
      const { data: res } = await this.$http.get("categories");
      if (res.meta.status !== 200)
        return this.$message.error("获取商品分类失败");
      this.catelist = res.data;
    },
    //获取参数列表数据
    async getParamsData() {
      //选中的不是三级分类
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = [];
        this.manyTabData = [];
        this.onlyTabData = [];
        return;
      }

      //选中的是三级分类
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes`,
        { params: { sel: this.activeName } }
      );

      if (res.meta.status !== 200)
        return this.$message.error("获取参数列表失败");
      //渲染展开行的数据，转化为数组，以空格分割
      res.data.forEach((item) => {
        item.attr_vals = item.attr_vals
          ? (item.attr_vals = item.attr_vals.split(" "))
          : [];
        //控制文本框的显示与隐藏
        item.inputVisible = false;
        //文本框输入的数据
        item.inputValue = "";
      });
      console.log(res.data);
      if (this.activeName === "many") this.manyTabData = res.data;
      this.onlyTabData = res.data;
    },
    //tab页签点击处理函数
    handleTabClick() {
      this.getParamsData();
    },
    //级联选择框变化函数
    async handleChange() {
      this.getParamsData();
    },
    //监听添加对话框的关闭事件
    addDialogClosed() {
      this.$refs.addFormRef.resetFields();
    },
    //点击添加对话框确定事件
    addParams() {
      this.$refs.addFormRef.validate(async (valid) => {
        if (!valid) return;
        const { data: res } = await this.$http.post(
          `categories/${this.cateId}/attributes`,
          {
            attr_name: this.addForm.attr_name,
            attr_sel: this.activeName,
          }
        );
        if (res.meta.status !== 201) this.$message.error("添加失败");
        this.$message.success("添加成功");
        this.addDialogVisible = false;
        this.getParamsData();
      });
    },
    //点击按钮，展示修改对话框
    async showEditDialog(attr_id) {
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes/${attr_id}`,
        {
          params: { attr_sel: this.activeName },
        }
      );
      if (res.meta.status !== 200) return this.$message.error("获取参数失败");
      this.editForm = res.data;
      this.editDialogVisible = true;
    },
    //监听修改对话框的关闭事件
    editDialogClosed() {
      this.$refs.editFormRef.resetFields();
    },
    //点击修改确认按钮
    editParams() {
      this.$refs.editFormRef.validate(async (valid) => {
        if (!valid) return;
        const { data: res } = await this.$http.put(
          `categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
          {
            attr_name: this.editForm.attr_name,
            attr_sel: this.activeName,
          }
        );
        if (res.meta.status !== 200) return this.$message.error("修改参数失败");
        this.$message.success("修改参数成功");
        this.getParamsData();
        this.editDialogVisible = false;
      });
    },
    //根据id删除对应参数
    async removeParams(attr_id) {
      const confirmResult = await this.$confirm(
        "此操作将永久删除该参数, 是否继续?",
        "提示",
        {
          confirmButtonText: "确定",
          cancelButtonText: "取消",
          type: "warning",
        }
      ).catch((err) => err);
      if (confirmResult !== "confirm") return this.$message.info("已取消删除");
      const { data: res } = await this.$http.delete(
        `categories/${this.cateId}/attributes/${attr_id}`
      );
      if (res.meta.status !== 200) return this.$message.error("删除参数失败！");
      this.$message.success("删除参数成功!");
      this.getParamsData();
    },
    //文本框失去焦点，或者回车，添加tag标签
    async handleInputConfirm(row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = "";
        row.inputVisible = false;
        return;
      }
      //输入内容合法
      row.attr_vals.push(row.inputValue.trim());
      row.inputValue = "";
      row.inputVisible = false;
      this.saveAttrVals(row);
    },
    //点击按钮，展示稳根狂
    showInput(row) {
      row.inputVisible = true;
      //文本框自动获取焦点
      this.$nextTick((_) => {
        this.$refs.saveTagInput.$refs.input.focus();
      });
    },
    //删除对应的参数可选项
    handleClose(index, row) {
      row.attr_vals.splice(index, 1);
      this.saveAttrVals(row);
    },
    //将attr_vals 的操作保存到数据库
    async saveAttrVals(row) {
      const { data: res } = await this.$http.put(
        `categories/${this.cateId}/attributes/${row.attr_id}`,
        {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(" "),
        }
      );
      if (res.meta.status !== 200) return this.$message.error("修改参数项失败");
      this.$message.success("修改参数项成功！");
    },
  },

  computed: {
    //按钮是否启用，true禁用 false 启用
    isBtnDisabled() {
      return this.selectedCateKeys.length !== 3;
    },
    //当前选中的三级分类的id
    cateId() {
      if (this.selectedCateKeys.length === 3) return this.selectedCateKeys[2];
      return null;
    },
    //对话框标题文本
    titleText() {
      return this.activeName === "many" ? "动态参数" : "静态属性";
    },
  },
};
</script>

<style lang="less" scoped>
.cat_opt {
  margin: 15px 0;
}
.el-tag {
  margin: 0 10px;
}
.input-new-tag {
  width: 120px;
  margin-left: 10px;
}
.button-new-tag {
  margin-left: 10px;
}
</style>